CONVERTER AND CONVERTER CONTROL METHOD
First Claim
1. A converter comprising:
- a PLL (Phase-Locked Loop) circuit including a detector circuit, a lock detection circuit, a filter circuit and an oscillator circuit, wherein the detector circuit is configured to detect a phase error between a first pulse input and a second pulse input and to generate an error signal indicative of the detected phase error, the filter circuit is configured to filter the error signal and to provide a filtered error signal, the lock detection circuit is configured to detect a locked or unlocked state of the PLL circuit in response to the error signal, and the oscillator circuit is configured to produce an oscillator output signal in response to the filtered error signal;
a pulse control circuit configured to receive the oscillator output signal and a feedback signal, and to generate a drive signal in response thereto;
a comparator circuit configured to receive and evaluate the filtered error signal to determine when the filtered error signal either falls below a first reference level or exceeds a second reference level that is higher than the first reference level; and
a pulse deleting circuit configured to receive the drive signal and to provide the first pulse input in response thereto, and also configured to receive a resonant current measurement from a primary side of a transformer circuit and to provide the second pulse input in response thereto,wherein the pulse deleting circuit is configured to delete one pulse of one of the first and second pulse inputs when the comparator circuit detects the filtered error signal falling below the first reference level and the lock detection circuit detects the unlocked state in response to a phase lag of the one of the first and second pulse inputs with respect to the other of the first and second pulse inputs detected by the detector circuit,and wherein the pulse deleting circuit is configured to delete one pulse of the other of the first and second pulse inputs when the comparator circuit detects that the filtered error signal exceeds the second reference level and the lock detection circuit detects the unlocked state in response to a phase lead of the one of the first and second pulse inputs with respect to the other of the first and second pulse inputs detected by the detector circuit.
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Accused Products
Abstract
Techniques are generally described for a converter including a PLL and a pulse deleting circuit. The pulse deleting circuit is configured to delete a pulse from one of the inputs to the PLL when a filtered output in the PLL falls below a first reference level and an unlocked state of the PLL is detected in response to a phase lag of one of the first and second pulse inputs with respect to the other. The pulse deleting circuit may also be configured to delete one pulse of the other of the first and second pulse inputs when the filtered output exceeds a second reference level and the unlocked state of the PLL is detected in response to a phase lead of the one of the first and second pulse inputs with respect to the other.
39 Citations
20 Claims
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1. A converter comprising:
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a PLL (Phase-Locked Loop) circuit including a detector circuit, a lock detection circuit, a filter circuit and an oscillator circuit, wherein the detector circuit is configured to detect a phase error between a first pulse input and a second pulse input and to generate an error signal indicative of the detected phase error, the filter circuit is configured to filter the error signal and to provide a filtered error signal, the lock detection circuit is configured to detect a locked or unlocked state of the PLL circuit in response to the error signal, and the oscillator circuit is configured to produce an oscillator output signal in response to the filtered error signal; a pulse control circuit configured to receive the oscillator output signal and a feedback signal, and to generate a drive signal in response thereto; a comparator circuit configured to receive and evaluate the filtered error signal to determine when the filtered error signal either falls below a first reference level or exceeds a second reference level that is higher than the first reference level; and a pulse deleting circuit configured to receive the drive signal and to provide the first pulse input in response thereto, and also configured to receive a resonant current measurement from a primary side of a transformer circuit and to provide the second pulse input in response thereto, wherein the pulse deleting circuit is configured to delete one pulse of one of the first and second pulse inputs when the comparator circuit detects the filtered error signal falling below the first reference level and the lock detection circuit detects the unlocked state in response to a phase lag of the one of the first and second pulse inputs with respect to the other of the first and second pulse inputs detected by the detector circuit, and wherein the pulse deleting circuit is configured to delete one pulse of the other of the first and second pulse inputs when the comparator circuit detects that the filtered error signal exceeds the second reference level and the lock detection circuit detects the unlocked state in response to a phase lead of the one of the first and second pulse inputs with respect to the other of the first and second pulse inputs detected by the detector circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method to control a converter, the method comprising:
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receiving, by a pulse deleting circuit, a drive signal from a pulse control circuit and supplying a first pulse input in response thereto; receiving, by the pulse deleting circuit, a resonant current from a primary side of a transformer circuit and supplying a second pulse input in response thereto; detecting, by a comparator circuit, when a filtered error signal of a PLL (Phase-Locked Loop) circuit falls below a first reference level and asserting a first control signal in response thereto; detecting, by the comparator circuit, when the filtered error signal of the PLL circuit exceeds a second reference level that is higher than the first reference level, and asserting a second control signal in response thereto; detecting, by a lock detection circuit of the PLL circuit, an unlocked state of the PLL circuit in response to a phase lag or phase lead of one of the first and second pulse inputs with respect to the other of the first and second pulse inputs and asserting an unlock detection signal in response thereto; deleting, by the pulse deleting circuit, one pulse of one of the first and second pulse inputs based on the control signal and the unlock detection signal from the PLL circuit when the first control signal and the unlock detection signal are both asserted; and deleting, by the pulse deleting circuit, one pulse of the other of the first and second pulse inputs based on the control signal and the unlock detection signal from the PLL circuit when the second control signal and the unlock detection signal are both asserted. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A method to control a converter including a PLL (Phase-Locked Loop), the method comprising:
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deleting one pulse of one of first and second pulse inputs to the PLL when a filtered output obtained through phase detection in the PLL falls below a first reference level and an unlocked state of the PLL is detected in response to a phase lag of one of the first and second pulse inputs with respect to the other; and deleting one pulse of the other of the first and second pulse inputs when the filtered output exceeds a second reference level and the unlocked state of the PLL is detected in response to a phase lead of the one of the first and second pulse inputs with respect to the other. - View Dependent Claims (20)
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Specification